First, my qualifications. None. I have been a fan of geophysical processes and phenomena for the last 35 years. More so if you count the time spent hanging out in the archeological part of the library.
When an earthquake occurs, the energy from that quake travels directly to the seismic station. Granted, there is more to it than that, and it actually takes a curved path through the earth depending on the density of the material (refraction), but for our purposes it’s a direct path.
When an earthquake appears in a seismic catalogue, you are given the latitude and longitude of the epicenter, and the depth. The addition of depth turns that position report into a hypocenter, because it locates the quake in three dimensions. In the more detailed phase portion of the reports, you can obtain the arrival times of the quakes. Take the difference in arrival times for each station with respect to the event time, and you have how long it took for the quake’s energy to reach the station. Knowing the distance from the station to the quake, and you can work out the speed of that seismic wave.
This presents a problem if you don’t realize what you are looking at. The distance from the station to the quake, is usually seen as surface distance if you use a map. This is not the actual path that the wave took. Remember, it takes a direct path. How do you find it?
Geologists, and geological organizations, think in terms of central angle when discussing seismic events. This is the angular distance as measured from the center of the earth that describes the arc length on the surface between two points. I’ve mentioned AK135 before, in it you can find the expected arrival times for the various phases based on our current model of the Earth’s structure. All of its data is listed by the central angle. It is used to assist in identifying what each individual squiggle in a seismic trace represents. (Based on the path that particular portion of the wave took)
For the simplistic technique employed here, AK135 and the more advanced concepts aren’t really needed… as long as we remember that this is a simplified approach, and prone to error.
Treating the orientation of the seismic station and the quake as being two points on a slice of a sphere, the problem reduces to being a series of calculations on a circle. You have the chord, which is point from the seismic station to a point equidistant from the quake on the other side of the quake. That chord will have a height which is the distance from it to the part directly below the epicenter. Calculate that and you can then find the parts of a right triangle when you determine the depth of the quake in relation to the midpoint of the chord. Find the hypotenuse and you have the direct patch distance to the quake. If your eyes have glassed over by now, don’t sweat it. It took me three days to get the spreadsheet formulas down. Sometimes you just have to get up and walk away for a while.
Now that we have the direct path distance, we can calculate the actual P-wave and S-wave speeds. We can do something with that.
Before we do, I want to point out (yet again) that this IS NOT seismic tomography. That involves far more than our simple juggling of the geometry and data.
P-waves are compression waves, much like sounds are a compression waves. The molecules move toward and away from the direction of travel. S-waves are transverse waves, they move side to side with respect to the direction of travel. The density of the medium that the waves travel through affects the speed of propagation, or how fast the waves moves. S-waves cannot travel through a pure liquid as S-waves.
When the rock density goes up, the difference in the speed betweed P and S waves grows smaller. With lower rock density, the speed difference grows larger.
About the Plots
I’m not going to interpret what the plots mean. I’ll leave that to Carl and the others. But I will tell you what they are (it took me a few days to figure this one out). They are a plot of the speed field of quakes in a particular area. The quadratic surface interpolates the regions between the individual quakes, and shows you what a quake originating there should look like if one occurred there… based on the speed of the ones that did occur.
Like I said, it’s not tomography, but failing that, it’s about as good a representation of what is going down there that we can obtain as non geologists, based on available data.
Since quakes occur over a period of time, these plots are a summary of what was observed over that period of time. In other words, they have very poor temporal resolution. Keep that in mind.
Other aspects of the plots show what would be expected from rising pockets of magma… compression of the overlying material, and a subsequent decrease in the speed difference of P and S waves.
The unnerving part of these plots, and why I was apprehensive about releasing them, is that they dovetail well with anecdotal information about the dynamics in play.
Again, my standard caveat: I am not a geologist and am not trained in that field. I could be very wrong in my methods. Take it with questioning view, which is sane way to look at it.
GeoLurking
Afterword: Peer review
In science when you wish to publish something new, you send the paper in and then a review-board reads it through, and either it pass and becomes published (often after revisions), or not.
Since this is something that can affect a lot of peoples lives the author wanted the post checked. So, here is how the peer review was done.
First I picked a part the reasoning, and then I looked if I would get the same result. I also went through the physics of it to see that it checked out.
Then the paper was sent to an engineer in the oil industry that works with tomography on a daily basis. And he found it to be correct.
After that I started to think about what other ways one could “see” what the author had found. So I deduced that the quakes that are smaller then 2M are just hiding the real action. So I tricked KarenZ and Ursula into plotting that, and guess what, the same structures showed up again. For those who follow the comments in here, those plots are there to be viewed.
I guess there are more ways we could have checked it, but in the end, I wished to publish this before the volcano became demented with old age.
CARL
I allow myself getting on with the thinking about a phrase that would be ours and still quoted by future generations.
When penguins walk across the yard,
the winter will be very hard.
Who pees against the wind might need a towel.
Fog on the sea, go have a tea.
When sheep are looking sad, the weather will be bad,
when sheep are looking happier, the weather won’t be better.
You’ve been busy! lol
From my experience on the mountains….
When sheep are looking sad, the weather will be bad,
when sheep are looking happier, the weather will be crappier.
Sorry. 😉
Nonono, don’t be sorry, that is much better! That’s the awful thing when you’re not writing your mother tongue. Thanks a lot.
Hell of a container ship you had to deal with… 🙂
It wouldn’t move out of the way, but they never do…..
I didn’t sail too close!
Container ship ahead – you better stay in bed…
Everyone seems to speak English much better than us lazy English speak other languages. 😦
That probably makes english the worst spoken language of the world… 🙂
(so many use it even if they don’t do it well)
Carl, the only way to learn to drive a car like that is from a racing driver on a track. There is so much power and handling that otherwise goes to waste….
Me in an earlier life. I could get in, but I doubt that I could get out of the cockpit these days!
Wrong reply box again, thought I’d cracked it….. 😦
That was re Carls Koenigsegg.
I loved that the car was crashed in the front.
Cool, so you’ve been a race-driver?
I never made F1 lol!
Most of my cars end up with the odd crunch here and there. 😉
Just Formula Ford, and just local for a short time (I live between Donington Park and Mallory Park tracks). I like to change my life on a regular basis. I’ve also been a coal miner, had a business repairing cameras (35mm mainly), been a climber, a sailor (maybe not much longer:( ) and had 2 divorces – so far! 😉
My wife is not too keen on the sailing either 😉
I’m still working on it.
It is not to late for another wife or two… 🙂
ha. nah, I’m keeping this one!
I guess the sailboat is going to be a small one for one Dad and one son. small boats are anyway more fun (and way less expensive)
And as a favour to GeoLoco, I will go Ovidian!
“Per aspera, ad Agera”…
Learn to drive it, because “volvo, ergo sum”…
Veni, vidi, volvi….
I came, I saw, I roled…
carl, no way – you wont do that. The throttle goes both ways.
Once you’ve power-slid the tail out,briefly, once or twice on a track – in safety – you’ll know where the limits are. And you wont get up there on public roads – you dont come across as a hooligan on here.
Problem is that I do not really like cars… I bought the car because I wanted a swedish car, and Saab is dutch and Volvo chinese… So it kind of got out of hand. 😦
I have to confess to being a petrol head. Not a modern image – but old enthusiasms die hard. I had a project in mind to ‘dual fuel’ my old supercharged TR, then the E85 fuel was taken off sale. So much for DIY engineering for both power and economy…
IGN has done some “Pimping” of their page…
http://www.01.ign.es/ign/resources/volcanologia/Galeria_Fotos/GaleriaFotos.html
I do not like their copyright – wrote them an Email to use the pictures for a non-profit foundation …… and as pexpected, NO answer yet (guess that is Yes)
Under EU law any picture produced by any state or EU funded agency is common property. That also goes for all their data. So it is free to use… 🙂
You may add one sentence to your letter: If you agree, do not answer. If you do not agree, let me know within one week.
I can now reveal that I am the answer to British Stealth attacks. Here I am being trained last year. I am about to take control of the power base. A very large Kite. The metal buggy can slip under the enemies’ surveillance. Kites could be the answer to taking good photos of the centre of Bob’s Jacuzzie. I am not volunteering.
PS Yes! my legs very rarely see the sun these days!
Cool! Never tried that….
I’ve seen sailing video taken from from a camera attatched to a kite flown from the boat, might try that one day.
We have the “miss november” page of our 2011 calendar.
Rofl! Mr Pirelli eat yer heart out! How about we run a competition for the 2012 Volcano Cafe Calender? Any subject ,male, female,animal, vegetable or mineral as long as it is loosely connected to the subject of volcanoes. Only 2 rules
1) The photo must be of or taken by the person submitting the photo.
2) Anything goes!
According to some sites this may be the last chance of such creative work as there will be no need to think about a 2013 calendar.
I’m up for it! lol
Rock included for possible volcanic qualification. The rock behind me was one I sat on earlier……
Kenpea,, You shouldn’t say things like that, coffee and Keyboards don’t mix well.
A little tip, if you spit coffee on them turn upside down immediately. Usually works, although i am on my second keyboard this year.
Love it!!! Mind you it looks as though you are about to head out to sea on the wings of a strong easterly. Your presence here assures me this was not actually the case.
It was on the Isle of Arran, and it was very windy!
We’ve still got 10 months to fill. 😉
We also do a mean version of stealth here in the UK..
Just the ticket for creeping up on erupting volcanoes without arousing suspicion!
What a lovely lawnmower!
Look at la Restinga webcam now. The middle one shows a lot of material floating on the sea but the lower one has just started showing what looks like a new jacuzzi, can anyone else see it?
A white pastch to the left of the picture and close to the edge. Wasn’t there half an hour ago. Wonder if it is a new vent?
Drat! Now they have changed the view. Still the ship that is there should know if it is on not.
Was going to check, but I can’t, because it’s just happily buffering, buffering, buffering….
If you see something cool, would you mind taking a screenshot and putting it up on tinypic, please?
I may have missed an explanation whilst I was away…but what is that mound of earth to the left of the view of La Restinga town. It looks like a small ash cone! Cars keep driving up and down it. I am sure it wasn’t there last week when I left. Maybe the camera angle has changed since last week.
http://www.hierroendirecto.movistar.es/
I have not a clue… I do not remember having ever seen it before.
Mysterious, wonder what Armas is up to now. Going to fill up the volcano?
It’s OK; it is a cinder cone, which shows very clearly on Google Earth.
It’s there on giggle earth,
probably a good place to view the activity !
Latest pictures Ursula. There seems to be more bubbles in front of the main jacuzzi and I also can see another light patch to the right side. The boat is between the older light patch and this newer one.
Under EU law any picture produced by any state or EU funded agency is common property. That also goes for all their data.
And this ended up wrong…
Screen grab of a ship examining the area; 11:20am
Have never seen that one before… Anybody that know what ship it is?
Been searching, but not found out what it is yet.
On Armand’s site there is a suugestion that it’s the Poseidon, but it looks different to me.
The Poseidon…..
It is SARMIENTO DE GAMBOA (Dredger)
Current location: Hierro
This fella:
http://www.marinetraffic.com/ais/shipdetails.aspx?mmsi=224713000&header=true
Increase of seafoam appeard just now
http://hierroendirecto.movistar.es/
That’s the one Christian!
What in the name of all Hork is this???
SARMIENTO DE GAMBOA (The Ship) is a dredger built in 2006, 71 meters long and weighing 850 tons.
If I combine that with Dianas new mound of dirt I get the horrible feeling that they have decided to try to fill in poor little Bob. Unlikely to succeed, and if the do succeed it would be to ask for a disaster… I hope I am dead wrong here.
Fill with what? :O
The mound to the left on the El Restinga cam…
Quick setting epoxy glue?
I would like to make a public announcement that that Mound is not mine and I will not be held responsible for whatever is happening. 🙂
😀
new tourist attraction for when Bob stops erupting: artificial volcano made of Bob’s sediments, replete with built-in jacuzzi on the harbour front. Entrada € 10. Webcams will be trained.
The mound shows very clearly on Google Earth.
How can they be so fast? 🙂
Naaaaaah, no one would be THAT silly…
Come on, they juste want good samples…
Please…
But what a joke of the century if anyone began filling up an erupting mound. That would just be the most behorked BOSEG ever done as a reaction to volcanic activity.
Somehow now I hope they will go for that… 🙂
Perhaps it is tippping soap powder in to liven up Bob as a tourist attraction?
here’s the ship: SARMIENTO DE GAMBOA
Doesn’t look anything like a dredger to me:
And again the AIS is switched off…..
I got this…
The mound was just inspected by a helicopter.
Which site did you get that from? I’ve been using http://www.marinetraffic.com
http://www.localizatodo.com/mapa/
Like it very much, it is quite informative.
Thanks Sissel, I’ll have a look now. 🙂
Good site, I’ll keep that one, but no sign of the ship again!
No, I think they switched off the AIS shortly afterwards and never turned it on again.
Maybe tomorrow, as they will stay for two days according to diario el hierro.
And there is Sarmiento again – further out, you can see it on the wabcam (and on localizatodo).
A very belated Great Plots to GeoLurking. Apologies for the delay, I have been getting my head round the maths (slow because it is a long time since I did maths) and trying it out on a few quakes myself. The maths I can now cope with, but manually extracting EQ phase data from IGN’s text files is not for the faint-hearted.
GeoLurking deserves several medals for the effort he is putting in on this.
@GeoLurking: on the very small sample of EQs I looked at, I noticed that a few for CHIE did not have arrival times for the P waves. Is this because the P wave data is lost in the harmonic tremor?
Now I see why the PS time difference was not plotted for each eq and displayed clour coded in a 3D swarm. Hence the use of the quadratic surface etc that I found so confusing?
Manual extraction – could we all work together and do all the eqs as a ‘distributed processing’ project? Scoop IGN- with its own data!!
I thought about trying to do it electronically but the download time was taking too long, indicating that it might be using too much IGN server time. So I aborted the download as I did not want to be held responsible for slowing down IGN’s servers. Multiple users on the site would have a similar effect.
So great idea but neither IGN nor the people on El Hierro would thank us if we stopped them from analysing critical EQ data.
Unless of course Carl or Lurking have a better way of getting hold of the data?
hey,
I’m following this and jon’s blog a while, very informative!
I saw a video on youtube which i found interesting.
I know it has to do with steam and pressure but the actual fhysics behind it i don’t know.
p.s the one who uploadded this video has also very spectacular videos about lavaflows,
see the right side on the youtube movie (my fav is etna)
Here is the ship Sarmiento de Gamboa.
Hello Una!
The ship must have passed at least twice today then, because here it goes from W to E, and on the picture from localizatodo it goes from E to W.
Hi Sissel! Hopefully we have luck and the ship find out more about this volcano.
I know that the boat will investigate both the north and the south side ofHierro (gravimetry and something more )
And bathymetry, that´s the word ( damn memory!)
If you go back to ER page (Armand) you will find a clickable link to the boat – a new oceanographic research vessel, 2004, crammed with all sorts of equipment. The dredger must be some other boat of the same name.
Here’s a link to more info on the survey vessel.
http://translate.google.com/translate?js=n&prev=_t&ie=UTF-8&tl=en&u=http%3A%2F%2Fwww.diariodeavisos.com%2F2011%2F11%2F29%2Factualidad%2Fel-buque-oceanografico-sarmiento-de-gamboa-se-incorpora-a-los-trabajos-de-investigacion-en-el-hierro
Translation by Giggle
How lies the Pevolca, is amazing …a tendency to deflation!
Thanks! Here is the translated text:
“The Sarmiento de Gamboa research vessel begins a campaign of research in El Hierro, under the Civil Protection Plan for Volcanic Risk (PEVOLCA), consisting of the geophysical survey of the seabed, both north of the Gulf and in the area submarine eruption near the south of La Restinga.
This vessel, involving the Geological Survey, Marine Technology Unit of the CSIC, the Spanish Institute of Oceanography and the Navy Hydrographic Institute, measurements of gravity, seismic profiles (refraction and reflection) and bathymetry.
The Sarmiento de Gamboa will be in El Hierro for two days, before starting a research campaign on the continental shelf of the islands.”
I really like the way we work together and find a lot of information!
I just hope it does not hide!
The ship class is a dredger but it’s been fitted and used as a research vessel.
http://www.marinetraffic.com/ais/shipdetails.aspx?MMSI=224713000
More about the ship
http://www.utm.csic.es/sarmiento.asp
This page is the national IGN. Here you can see further information from the earthquake of Hierro. Even tells us where the populations have been felt it. Click Info.
http://www.01.ign.es/ign/layoutIn/sismoTerremotos30Spain.do
Sissel, how are your eyes? 🙂
Haha, they are fine at the moment, but I made some small mistakes again – never underestimate Jalapeñjas!
Someday you should try the pimientos de La Palma ….
I will not say its name because it is an ugly word, but I think they are even more spicy jalapeños.
If someone would send me a couple of seeds I would like to try growing them (hint)!
I will send you a couple of kilos. 😈
Pack some sun with the peppers as well before sending it, Una, the ‘jalapeños’ need the heat of the sun to absorb the heat for the tongue… That’s why peppers from tropical regions are hotter…
I have to tell you that the peppers from my garden are V-E-R-Y strong! In spite of the latitude of a little more than 50 degrees N.
They may be used on the Burfell party BBQ. You will never forget.
No, try naga chillies, wow! Flaming and never forgotten.
Can anyone confirm if this is true?
In heavy snow storms cattle put their noses into the wind and walk till they get to an obstruction they can shelter behind. Sheep on the other hand put their behinds to the wind and walk until they get to an obstruction where they get buried.
Let’s raise our hands up in the air and wait for Diana’s enlightment…
In Iceland in the winter time, it’s possible that sheep get buried in snowfilled ditches, this happens every year. They seem to seek out the shelter of ditches in the storm (not a lot of trees in Iceland), and when the snow comes, it can bury them.
In the northwest of Iceland, near Hólmavík (Westfjords), there is a museum specialised in sheep breeding. On their webpage, they are talking about different kinds of danger for sheep (rollur in Icelandic – pron. rodler], among others that they would die in the snow (= fönn – Í óveðrum á haustin er alltaf hætta á að kindur fenni.). http://strandir.is/saudfjarsetur/frodl-kindin7.htm
Could be an interesting excursion to go to this museum, it’s a beautiful region there, too. http://upload.wikimedia.org/wikipedia/commons/1/15/Dj%C3%BApav%C3%ADk.jpg
I know the museum well, when I went there first, some years ago, the explanations were just in Icelandic. Being a guide, I talked to the people there about it, that it would mean additionnel income to have also guests from foreign countries. They first thought, it would perhaps not be very interesting for them, but I insisted – it is, as we here know best.:) And last time I was there, they had also explanations in English.
By the way, there is another interesting museum at Hólmavík, the museum of sorcery, because the inhabitants of the Westfjords esp. in the Middle Ages and till the 17th century were known for their witchcraft. http://upload.wikimedia.org/wikipedia/commons/d/dd/H%C3%B3lmav%C3%ADk_1.JPG
Anyone who has ever owned sheep must know that they have an inbuilt death wish! … and where one goes the others follow.
@ Woomf. That is why they have a sheep called a Jacob sheep. This sheep is used to lead the sheep that are to be killed into the slaughter house. The Jacob calmly walks in and the other sheep follow without panic. A sad fact but true.
What a strange question ….
You’re posting on this site and you consider this a strange question 😯
Do not know but I suppose the sheep have found the most intelligent method to build a fitting iglo which protects them against the storm 🙂 .
Oh, I see … you say for the love you have it to the sheep 🙂
See what curious!. It’s an animation of Sarmiento de Gamboa performing a bathymetry.
http://www.utm.csic.es/doc/bo_sarmiento_de_gamboa/animaciones/multihaz.swf
So THAT is how it goes! Mapping Bob. Nice clip!
Perhaps if they’d done that four months ago we’d have a ‘before’ scan for comparison.
Looks like more action on the webcam again, but I can’t get the zona de Erupción.
Try with this one.
http://www.elpinardeelhierro.com/periodico/
Yes, you can see the bubbles!
Yes that is the best one, it always works. But I wanted to look closer to the shore and more to the right – but that cam keeps connecting all the time. Hrrrmmf.
But sometimes appear and sometimes disappear,I do not know why.
Maybe it’s the start of something bigger.
Now what is that showing on the lower cam, a boat?
Well no boat as it has gone again. It looked again like a fiery fountain but I suppose must have been a trick of the light, it is so difficult with the bright light when it shines on the sea.
Oh dear, I wonder if I have been fooled by that annoying light refraction on the lens. Sorry folks.
What a shock! I was already going crazy looking for the boat
Bubbling now showing on the top screen of this site.
http://earthquake-report.com/2011/11/12/32535/
I also saw what I thought was a sailing boat on the lower cam but it disappeared as I watched so I wonder if it was a spuot of water. Too hard to see at that distance and the middle close up cam is just constantly trying to connect.
Really sorry bit I don’t know how to take a screen shot. Kids haven’t taught me that.
Oh, oh! Bubbles again…
Come on, Bob! We want to see some of your pyroclastics. Nah…bubbles have disappeared again.
Soooo frustrating isn’t it. I saw it really bbbling also earlier today but as I don’t know how to take a screenshot it is a shame not to be able to save it for others. I really must try to learn. I think someone mentioned on an earlier thread how to do it. I think I must try to find it and practice the method.
I do not know either. But you’re right, it’s the only way to catch those bubbles that appear and disappear all the time.
Do you have Windows?
Do you know how it make it?
If you’re on a Mac it’s:
Shift+comd, 3 (the proper key, not on the number pad)
I have Windows.
I am on a windows laptop and running Firefox.
I only know the windows world – and yes I can make screenshots
Sissel, any info of how you do it would be greatly appreciated.
If you have Windows you also have the (ancient but good) program “paint”. Ever used it?
Sorry no and as I have google chrome I can’t find it. I will ask my son when I see him though.
I think no matter what browser you use. If you want to give you the link. It’s in Spanish, but easy to translate. Just try it.
http://es.kioskea.net/faq/3889-hacer-una-captura-de-pantalla-en-windows-vista-o-7
I think I know. I found it on Google.I will try to do it when the bubbles get out.
Hi Una Canaria, thanks for the link, my son has just come in and says a bit later he will show me how to do it and write it down for me. I am not very good at following written instructions and find it much easier when shown how to do it. I blame being older but I mustn’t let my brain seize up for lack of use. I need a lot of practice though so hope for lots more action on the cams.
When someone wants to learn, no matter the age. And do not say you’re old, because maybe I’m older than you! 😥
I think not! Nobody on here is older. I don’t think they will admit they are anyway. I am 62
Shhhhhhhh Newby. Don’t tell anyone but I was 67 on Sunday 🙂 I hope that makes you feel very much younger 🙂
@ Diana: ha, another Sagittarius. 🙂 Happy belated birthday!!!
Good guy, your son! Remember, it is very easy – you will laugh when you know.
As a preparation, search for the Prt Sc button on your keyboard!
Una,
Presione ‘imp pant’. es la clave de 4 º de la parte superior derecha del teclado.
entonces se puede pegar a una página en blanco de Word de Microsoft, si no tiene una programa del ‘paint’
Gracias, ovejamecánica! Da gusto tener asesores de informática en un blog de volcanes.
Lo hice! Gracias. 😉
translation (ish)
press on ‘Print Screen’ it’s a button probably at the top right of your keyboard
you can then paste that screenshot into a blank word document if you don’t have the ‘paint’ program
the paint program lets you save it as a few different file formats – it you want the biggest file with the most info save it as whatever file name you pick.bmp, but thats usually not the best choice i’d suggest you pick filename.PNG as that stores the data more efficiently without trashing the image (which jpg sometimes does)
incidentally if you’re more PC literate and want a decent free equivalent to photoshop I’d suggest getting paint.net as that seems to do prettymuch everything photoshop/illustrator does and it’s free
But Photoshop is a little (ehemm) more complicated than Paint, so if you want to start easy and free Paint is a good base.
Sorry Edward, read too fast – thought you recommended Photoshop!!
Thanks for the explanation! I’ve done with the Paint and the image has been perfect. Now I have two ways to capture screens.
Ref carbon fibre ship building.
Not a new technology. Carbon fibre is one of the strongest yet flexible construction materials known to man.
Wr used to call it “wood”.
Charred wood. Basically you build a wooden ship, set it alight, wait a bit and put it out. Now you have a carbon clad boat.
Is this how it is being done?
😆 Very funny, Sissel!
Yeah, and used to use tar and sap as binder too… Oldest composite boat I know of is from 1492 in Venice.
ok, first person to see a mermaid on the webcam wins a sheep.
Scratch that.
First person to see a sheep on the webcam wins a mermaid..
that’s not right either, dang it..
First one to see a mersheep wins a volcano?
that might just be realistic… there were plenty of black ones out there the other day.
I see a dalek sheep – can I have my dalek mermaid delivered please
or can I look on any old webcam ?
lol cheat!
you made the restrictions a little wooly round the edges – can you blame me ?
Merdaleks! lol
Wow their beauty is a wonder to behold
First to see a sheep on a mermaid gets a webcam to share this natural wonder.
Imagine the result, a hairy baby that smells like fish…
Mermaids: Half tuna, half chick. Kind of its own, definitively strange.
I don’t believe it, someone has already combined the two!!!
http://www.clker.com/clipart-156682.html
That is simply madness!
or even this….
http://www.google.co.uk/imgres?q=mersheep&hl=en&sa=X&biw=1036&bih=628&tbm=isch&prmd=imvns&tbnid=vYDO7MC4ijM45M:&imgrefurl=http://www.elfw
Look at this, just came across it, this is the software we’d need for Lurking’s 3D magic:
http://www.mve.com/software/move
it’s a tad pricey – so it had better do what it says on the tin
Ursula… Even I think that 3500£ is a bit steep for a piece of software 😉
Could you register us as a University so we get that Free Teaching Software price?
I know it’s pricey. 😦
I just said this could probably what my voxler can’t…
And unfortunately my university is not on the list (and we don’t actually have geology dept here, so no dice, sorry).
Edward, you have definitely been watching the webcam too long!
Bruce, you recently told me you think we live geologically close to each other. So where are you?
sorry, yes, I didn’t get back to you. To the west of Stuttgart, about an hour and half from the Swiss border. It sounds like you live near Bregenz ?
No, you could say near Bern.
Actually live in the Prealps.
ah! the Jura! extends right through to our neck of the woods too. Nice! Still, not too far away. If you blow your Alphorn I might just hear it.
I’m not elastic enough to blow my alphorn by myself…
Nono, not the Jura. The Prealps. Geologically another beast. But I work in the Jura-area (quite a bit from home), tectonically speaking. Switzerland is small, you’re fast from one point to another. Stuttgart really isn’t far.
I see a lot of thirsty people in here, remember that the Bar is open 🙄
Spoilsport… Go and write a new blog post instead. Bad mountain troll 😉
If you write it, they will come 🙂
Good idea!
Wot maks U fink we R firsty?
Arrrr OT p’raps?
😳 jus’ practisin.
comment ported from Jon’s blog
Mr. Moho says:
November 29, 2011 at 18:21
It looks like we have drumbeats at El Hierro:
http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2011-11-29_16-17&estacion=CHIE&Anio=2011&Mes=11&Dia=29&tipo=2&hora=16-17
Drumbeats are repeating (in an almost rhytmical way) self-similar earthquakes.
– and I wondered what was going on to cause that 🙂
is that something generating banging sounds to let people do more Lurking type plots ?
OH!!!! That looks interesting! Wish I knew what it signified? Come on you clever people you are needed NOW.
Where are the clever people when you need them ?
ok well it appears to have started with a series of 12 bangs in 4 minutes, then been followed by 20+ bangs spaced out at regular 2 minute intervals
they seem too regular to be anything natural but perhaps it’s a particular size chamber that fills in 2 minutes and empties – a bit like a geyser ?
Clever people? Where?
Buut seriously, Sissel nailed it down below.
“Drumbeats” are associated with increasing pressuge against plug in a volcano. Now I wish we knew where that plug is… It is a sign of an eruption coming closer.
Could one of our clever Plotters Plot a Plot of the Plug?
Re: plotting: this started at about 16:20.
Since then, IGN Hierro boletin lists three (only) earthquakes:
1) 2011/11/29 16:19:23.24 27.6160 -18.0755 3.70 2.70 28 2.10 3.3 1.60 0 8 8 0.40 283.0 1115502 SW EL PINAR.IHI
2) 2011/11/29 16:22:29.24 27.6536 -18.0758 4.60 3.10 8 3.80 3.3 1.40 0 8 8 0.29 255.0 1115503 SW EL PINAR.IHI
3) 2011/11/29 17:16:15.46 27.7655 -18.0631 37.30 6.90 164 21.70 7.1 2.20 0 5 5 0.18 209.0 1115509 W FRONTERA.IHI
So, nothing much to plot…
Although since 1&2 are close apart, this is probably Bob (see location):
Ursula, if that’s the plug, it’s a pretty deep one: 15 to 22 km.
Bruce, it may not be the plug – it is just only three earthquake points published until now (so the only thing I can plot)…
Actually, Bruce, the first two depths are much shallower, they are 2.10 and 3.80 km!
Thanks to Sissel and you Carl I have learnt something else new today and when I can drag my son from computer games I will know how to publish a screen grab. Two things in one day! Overwhelming. 😉
Here is som information on “drumbeats” in Mount St. Helens: http://news.nationalgeographic.com/news/2006/11/061122-volcanoes.html
“The current eruption of Washington State’s Mount St. Helens, which began about two years ago, has been marked by a series of weak, shallow earthquakes, or “drumbeats,” that occur every couple of minutes, a new study says.
The “slip/stick” motion of the rocky “plug” being pushed out of the volcano is causing those rhythmic quakes, according to scientists from the Cascades Volcano Observatory in Vancouver, Washington (Washington State map).”
Many thanks for that Sissel, I wonder if this indicates a newer eruption area is about to happen.
Lurking, please tell us, where is the plug?
See my comment above (at 19:09):
Three locations? Would expect just one!
I also wonder if the drumbeats are strong enough to have been listed anywhere. There have been tenths of them in short time.
verrry interesting… let’s see what happens next. Either it’s the dying putt putt putt of the active vent or, much more likely, something else is afoot.
Bob’s still drumming… and there are stronger bursts around 20 to 30 minutes apartt
It could be for this reason:to make a study of the earth’s crust, ship Sarmiento de Gamboa has to launch seismic waves that are reflected in the seismographs. Is this not the way to make a “scan” the crust of the Hierro?
that was my suggestion at 18.35 🙂
Ah….
doh.. that’d be it. wish I’d understood you the first time! Well thought.
I got this record of the track that the Sarmiento de Gamboa took today.
Thanks to Sissel.
The ship Hesperides has almost the same technology as the ship Sarmiento de Gamboa. Here they describe a technique of his acoustic equipment, the sound source.
It is in Spanish.
http://www.elpais.com/especiales/2000/hesperides/cuaderno14.htm
@ Geolurking
A stonkingly good blog, sorry I;m a bit late reading here, however…!!
Anyone fancy a ‘health and safety’ moment?
Aaaaaarrrrggggghhhh!
And not a safety rope to be seen. Argh, I fell out of bed the other night and nearly lost my nerve to ‘get back up there again’. 😉 This has made me scared to sleep now.
Well at least he’s wearin’ an ole ‘ard ‘at!!
Risk assessment – wos that!! – may drop lunch!!
The French used to shout “Guardez l’eau” when emptying water into the street. The English used a corruption of it, Guardy Loo, when they emptied their chamber pots into the street. Wonder what these blokes shout when they need a toilet break. 😳
I hasten to add this was many, many years ago in London. hahaha
Mersheep
No Lambphrey
I’m going to have a coffee, I’m seeing terrifying visions 80
roflol
ah schweet..
Sorry, but that is scary… If I was snorkling and saw something like this, I’d drown.
😉
Hahahaha. thanks for the laugh!
OK
Wash woollens in cold water……..
Nobody said they were nice.
Sorry didnt work
Was a sheep crossing a river
Do sheep swim? Yes, they also drown. I stayed in a small cottage on Mull one year, many years ago. On the 7th day I went for a walk up the hill and discovered where our water came from. A small loch complete with a drowned and bloated sheep carcase floating in it. Brother felt sick, I just thought it funny and boiled the water after that. Well I had boiled it anyway but hadn’t bothered when brushing my teeth! I did after that!
No fear! The Mersheep would save you by bringing you back on land and give you a big cup of hot chocolate.
Sissel, you’re always so positive! 🙂
Melhnausar – just a little action
Where is it Alan?
South of Krafla, North of the Hreid… that I can’t spell!!
Herdubreid
Hmmm, that drumbeat is still there but fainter. I wonder what tomorrow will reveal?
http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2011-11-29_18-19&estacion=CHIE&Anio=2011&Mes=11&Dia=29&tipo=2&hora=18-19
Actually, looking at this graph http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2011-11-29&ver=s&estacion=CHIE&Anio=2011&Mes=11&Dia=29&tipo=2 it has been their throughout the day but has just speeded up.
hmm… I’m going to wait for the experts on this one. Most strange.
just an outlandish idea. but if the two nests of seismic activity indicate two distinct locations of melt that hasn’t yet interconnected, then perhaps this drumming is a sign of them interconnecting… resonance patterns getting set up or something, at least this would tie in with the location of the last quake.
forget this, Edward’s got a much more plausible explanation above.
Yes, but is the ship still around and why the change in time frequency?
is the ship in motion – is the aircannon irregular in it’s function, are some of the quakes real ones mixing the signal or is this really volcanic – I think it needs a plot showing where they are centred and then someone to dig out that ship movement link – and see if they tally up.
No they are still there although fainter. I am afraid I don’t buy the ships sending out seismic waves theory unless someone can show me the ship is still in the area. I would still go for natural tremor rythme. But then I am just an old granny. 😉 I do still have an inquiring , if sceptic, mind though.
or perhaps it’s easier ? for someone to ask the ship if they are making rythmic pulses that are picked up on the seismographs
@Newby – Plaudits for the sceptical attitude 🙂
currently I’m leaning away from the aircannon toward actual volcanic – as I think I can see it detected on other stations – and I’m guessing the ship would not be capable of generating such powerful bangs.
but I’m not a volcanologist and I don’t know diddly squat about it 🙂
Ship is still in the area, and seems to be sailing a “box” …….
Looks like a volcano sized version of “water hammer” that you get when there is air trapped in your water system at home.
Gas in the system?
I know more about home water systems than volcanos….. 😉
Actually, that is one of the 2 things that is most likely to cause it. See my post 😉
On my way!
New post up about the Drumbeats!